USB working incompletely (GSM tools)

Description

I have many USB hardware for GSM programming like UFS, JAF boxes, smart-card readers etc.

All hardware can be detected on USB okay, but some hardware like smart-card readers working, but the most important UFS box is not. UFS' leds is blinking when it accessed, but then software prints "communication error". Nokia PC suite is not working too if the phone on USB. Some Siemens FFS-init software (working on PL-2303 usb-to-com cable) work but very unstable, can lose the phone half-programmed.

May be there is some timing-problems with USB... I don't know. Tell me if you need any logs or details.